OKLAHOMA CITY – Brittney Martin scored 17 points and grabbed 11 rebounds as fourth-seeded and 18th-ranked Oklahoma State pulled away late to beat Iowa State 67-57 in the quarterfinals of the Big 12 tournament on Saturday.

The Cowgirls (23-7) got 14 points each from Tiffany Bias and Brittany Atkins and Kendra Suttles, who was clutch off the bench down the stretch, had 11.

The Cyclones (20-10) tied the game at 52 with 8:45 to play but went cold. OSU used a 6-0 surge for separation and closed the game by hitting 6 of 8 free throws. Suttles scored seven straight points for the Cowgirls as they pulled away.

Hallie Christofferson led Iowa State with 21 points and 11 rebounds and Nikki Moody had 14 points. ISU shot just 34 percent, going 7 for 25 from 3-point range.

Oklahoma State shot 50 percent and forced Iowa State into 16 turnovers.